MUNCIE METAL TAGS

[MR-427]

I also have a 3915077 and 3867268..I havent a clue what either is..I believe the 3867268 tag was from a 1968 m-21

[Mr.Nickey Nova]

[ QUOTE ]
Lots of people contributed,but credit goes to Chuck Hanson for publishing this all in last months Chevelle World.Box #28 on the Buildsheet will reflect the 2 letter code as well.
<u>Muncie ID Tags</u>
1964 M20 3841435
1965 M20 3857577
1965 M20 3857578 Z16
1966 M20 3870357 L-34 L-35
1966 M20 3890534 L-78
1966 M21 3877459 ALL
1966 M22 3879993 L-78
1967 M20 3870357 L-34 L-35 L-79
1967 M21 3877459 ALL
1967 M22 3879993 L-78
1968 M20 3915079 L-34 L-36 L-78 L-79
1968 M21 3915085 L-34 L-36 L-78 L-79
1968 M22 3925626 L-78
1969 M20 3950301 L-48 L-35
1969 M20 3946767 L-34 L-78
1969 M21 3946798 ALL
1969 M22 3950318 L-78 COPO L72
1970 M20 3952659 WB
1970 M21 3968012 (disc.3-11-70)
1970 M21 3968011 WL
1970 M22 3978766 WO
1971 M20 3974484 WN
1971 M22 3978766 WO
1972 M20 3974484 WN
1972 M22 6271517 WJ

[/ QUOTE ]
Rick,I take it that these are for Chevelles only.I have a 3968011WL on my Nova that is a M21.Could this number been used on other cars also in 1970.

[Mr70]

Although printed in a Chevelle themed publication,those are not Chevelle specific.
Yes,other vehicles shared them.

[COPO CARTEL]

For what it's worth if anyone has a 3950318 I would be interested in purchasing one. Thanks Doug

[jamesholden]

have a 3946797 tag. original. M20
not typo

james
530.941.4399

[Lynn]

[ QUOTE ]
have a 3946797 tag. original. M20
not typo

james
530.941.4399

[/ QUOTE ]

That is what my M-20 has. I beleive that is correct for 69 Camaro with Z/28 or L78.

[crash]

Tag Number 3946767 in the list from the Chevelle report is wrong, should be 3946797... Crash

[Mr70]

I do believe you're right,but it's in A.C.E.S. Chevelle World magazine.

[luv2sixty9]

The 3946797 is for the 1969 M20 Trans. I'm looking for 3946798 if anyone has an extra.

[Lynn]

From the assy manual for 1969 Camaro (don't know about Chevelle or 67-68 Camaro)

3950356 is for RPO M20 with L48, L34, L35, LM1
3946797 is for RPO M20 with Z28 &amp; L78
3950316 is for RPO M21 with L34
3946798 is for RPO M21 with Z28 and L78
3950318 is for RPO M22 with Z28 and L78

Evidently, from this and from the RPO spreadsheet file in pdf available at camros.org, you could not order a close ratio (M21 or M22) unless you had L34 (M21 only) or Z/28 or L78.

Now, for another question: Why is there a different tag number for the M20 behind a Z/28 or L78 as opposed to the one behind an L48 engine? They would be identical outside dimensions. The Z and the L48 would have identical shifters and brackets. Was there anything internally different between a Z/28 M20 and the regular small block SS M20? There had to be something different about these transmissions to warrant different tags. Maybe the standard rear gear ratio?